Method of coating metal



March 1936. c. H. H. FEssLER ET AL I 2 9 METHOD OF COATING METAL Filed July 23, 1932 2 Sheets-Sheet 1 i evniaxs':

CHEL H H FsssLEe and 650E65- J PUCHT/q March 3, 1936.

c. H. H. F ESSLER ET AL METHOD OF COATING METAL Filed July 23, 1932 2 Sheets-Shet 2 Patented Mar. 3, 1936 UNITED STATES PATENT OFFICE IMETHOD OF COATING LIETAL tion of New Jersey Application July 23, 1932, Serial No. 624,297

1 Claim.

This invention relates to a method and apparatus for protectively covering strip metal, one of the inventors objects being to produce a durable and good looking finish. Other objects will be made apparent by the following disclosure.

Having reference to the'accompanying drawings, which show by way of example a specific form of this new method and apparatus,

10 Figure 1 is a top plan;

Figure 1a is a continuation of Figure 1;

Figure 2 is a side elevation;

Figure 2a is a continuation of Figure 2;

Figure 3 is an enlarged cross-section of a de- 15 tail shown in Figures 1a and 2a;

Figure 4 is a fragmentary enlarged cross-section of a detail shown in Figures 1a and 2a; and

Figure 5 is an enlarged end elevation of a detail shown in Figures 1 and 2.

20 The invention is particularly applicable to coating fiat strip steel or other shapes with varnish or lacquer compounds.

In detail, metal strip, generally indicated by the arrow-headed. lines, passes between tension 35 blocks I carried by a substantially built standard 2. It then goes over and under a number of rollers 3 which guide it through a body of coating fluid 4 in a container 5. A set of brushes or wipers .6 is arranged in this container well above 30 the fluid body to remove any excess, the container being shaped to return this to prevent waste. Vertical rollers 1 are arranged at the container's exit portion for horizontal guidance of the strip; When a plurality of strips is being coated these 3.3 rollers serve to keep them separated.

An electrically heated baking oven 8 then receives the strip and hardens the coating fluid on it. Preferably, this is provided with a horizontal screen 8* located directly above its electric 40 heating elements. This screen functions to pre= vent a shortv circuit in case of strip breakage. This oven is supplied with a venting suction device 3 to remove any obnoxious fumes driven from the coating fluid by this heating.

The strip now passes through an open ended chamber l equipped with a blower fan II that creates a cooling current of air directed oppositely to the stripstravel. Just before it enters this chamber it is sponged by a set of absorbent rollers l2 which are arranged with their lower portions in a body of cooling fluid l3.

This cooling enables the application of wax to the strip when properly proportioned to the heat of the same upon entering the chamber Ill, 10 which may be done by varying the speed of the blower fan, length of the strips travel, or the cooling fluids character.

Waxing is accomplished by a number of absorbent pads l4 supplied with a waxing medium by an elevated supply tank l5 through a header l6 and spigots H, the strip passing between these pads. The waxing medium mentioned may be a solution of paraflin and naphtha.

The strip is drawn through the various parts of the apparatus by a pulling mechanism l8 and is finally wound in reel form by a take-up table arrangement I 9, this final product having the desired finish. Preferably, a wipe is arranged on the pulling mechanism l8 so that a final 3 smoothing or polishing is given the waxed strip.

This specific form of the new method and apparatus has been disclosed in accordance with the patent statutes and not as a limitation of the inventive scope, except as defined by the following.

We claim:

The method of protectively covering strip metal consisting in passing it through a body of coating fluid, wiping it free of any excess of this fluid 3. when entirely free from the body thereof, heating it to harden the fluid remaining thereon, sponging it with cooling fluid, passing it through a cooling chamber and waxing it as it leaves said chamber.

CARL H. H. FESSLER. GEORGE J. PUCHTA. 

